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Re: Current in a wire



In a normal metal, the current is uniformly distributed across the
cross section of the wire for dc and low frequency ac.
(In contrast, all the current is on the surface if the wire is
superconducting (Type 1). This distribution occurs because of the
Meissner effect--there is no magnetic flux within the bulk of such a
superconductor.)
Excess charge appears on the surface at bends of a normal
wire--required to bend the electric field along the axis of the wire.
Tom Sandin